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One of theory of their origin is that oozes are tied to the creation of the planet, as if they were a secretion of it. Chemist Fuely suggests that oozes may be connected to the Old Gods, a theory supported by the presence of Viscidus, a large ooze, in C'Thun-controlled Ahn'Qiraj ( [56] ... and a Batch of Ooze). Another theory classifies oozes as magically-created beasts intended to keep empty dungeons and underground sewers free from rats, roaches and possible invaders - magicians would conjure oozes as guardians of such places.

In Night of the Dragon, a group of dwarves encounter an ooze in the Wetlands. The creature is attacked by one of the dwarves, but as the dwarf's weapon sinks into the ooze, the dwarf is sucked in. The dwarf is quickly dissolved before his fellows' eyes.

Oozes (subspecies include slimes, primal oozes, black oozes, sludges, or sludge beasts) generally consume anything they move over, and have been known to consume small mammals and even gnomes. As such their bodies are usually peppered with items that they can not digest such as bones, arrow heads or the odd piece of armor. Though it is somewhat counter-intuitive, rogues can pickpocket oozes. Because oozes so readily absorb everything around them, they tend to closely reflect their environment. For instance, oozes and slimes that live in areas tainted by the Blight, often have the ability to pass on terrible diseases to those they attack. The most "pure" oozes that haven't soaked up too much foreign material are located in Un'Goro Crater.